A particular star has an absolute magnitude of + 12 and a spectral class of A5. Using Figure 17-18, how would this star be classified?

Question

Quizplus · Accepted Answer

The absolute magnitude of +12 is significantly fainter than what is typical for main sequence stars (including A5 V), giants (A5 III), or supergiants (A5 I). This faintness is characteristic of white dwarfs, which are much less luminous than other types of stars with the same spectral class. Therefore, an A5 star with an absolute magnitude of +12 would be classified as an A-type white dwarf.

A Particular Star Has an Absolute Magnitude of + 12